As Bizo mentioned, this sound can be made using a detuned saw with some chorus, dimension expander and a lowpass filter. I personally have used it as more of a mid bass with portamento (glide) and then layered a sine wave sub underneath with slight pitch shifting, mimicking the saw bass. This may not be exactly what you are looking for, but I think it does make a pretty nice bass sound and a little bit more full sounding overall. Hope this helps.
